SU934174A1 - Apparatus for heating ignition hearth of sintering and firing machines - Google Patents

Description

(S) DEVICE FOR .CHARMING HEATING

HILLS AGGLOMERATED AND BURNING MACHINES

I

The invention relates to the preparation of raw materials in ferrous and non-ferrous metallurgy, in particular, to the design of sintering and firing machines of a conveyor type.

The closest to the invention to the technical essence and the achieved result is a device for heating incendiary furnaces of sintering machines, located on the roof of the furnace and containing a housing, a central pipe with an open gas nozzle and a stabilizer, a tangential nozzle for air supply, toroidal burner stone. In this device, the air flow is divided into two: peripheral and central, which provides some reduction in the length of the Cl1 torch

The disadvantages of the known device are insufficiently wide limits for regulating the heat load of the hearth and the flow rate coefficient of air, the rapid exit of the gas pipe nozzle due to its location in the root of the burning plume, i.e. in the area of development of temperatures of 11 and above, increased specific heat consumption per process, uneven heat treatment of the sintered layer and, as a result, reduced quality of the finished product.

"R

The aim of the invention is to improve the reliability of fuel combustion in a flat P and open flame torch at an air flow ratio of 1,, 5 in a wide range of variation of heat load and a reduction in specific fuel consumption per process.

This goal is achieved by the fact that in a device for heating incendiary furnaces of sintering and firing machines, located on the roof of the hearth and containing a housing, a central tube with an open gas nozzle and a stabilizer, a tangential air supply nozzle, an air twist housing, a mixing unit and A toroidal burner stone stabilizer, the diameter of which is 0, -1.0 caliber of the device is placed on the nozzle section with an inner diameter equal to 0, 8 caliber of the device, and at a distance of 0.2-P, the caliber of the device The nozzle is located mixing node, the length of which is 0,, 0 of its diameter. The operation of the vault fuel-burning devices on sintering machines of the conveyor type must ensure the safe and effective ejection of any gaseous fuel in which the hydrogen content does not exceed in a flat open torch with an air flow rate exceeding 1, i. At the same time, the regulation limits for the heat load should be no less than 1: 5 Experimental data showed that the proposed design of an arching device for heating incendiary horns ensures reliable fuel combustion and a fairly uniform heat treatment of the sintered agglomerate layer. Stable operation of the fuel-burning device is ensured by installing an annular stabilizer at the nozzle gas cut and optimizing the ratios of the main structural elements of the fuel-burning device. The ring stabilizer is mounted on the nozzle exit on its outer side and has a diameter of 0, 0 device caliber (device caliber means the diameter of the output section of the mixing unit). The stabilizer is installed in the path of the swirling air flow directly at the cut of the gas nozzle. Otherwise, the stabilization of the swirling air flow does not occur, the efficiency of mixing air with gas decreases significantly and the combustion process becomes unstable. Moreover, the stabilization diameter must be at least 0.9 caliber of the device, since otherwise reliable stabilization of the swirling air flow does not occur. With a stabilizer diameter greater than 1.0 gauge device, the stabilization process is no longer improved, and the aerodynamic drag of the system increases significantly. The diameter of the gas nozzle of the central tube should be 0, 8 gauge device. When the diameter of the nozzle is less than 0.5 gauge of the device, the gas flow rate at the exit of the nozzle becomes excessively high and a part of the gas flows through the flat flame, which is unacceptable. When the diameter of the gas nozzle is larger than 0.8 calibres of the device, the torch stabilization is disturbed, the combustion becomes pulsating and the aerodynamic resistance of the air jet increases. The distance between the gas nozzle and the mixing unit should be 0.2-0, the caliber of the device. When the distance between the nozzles and the mixing unit is less than 0.2 caliber of the device, the aerodynamic resistance increases significantly, the gas-air flow is deformed and the development of the torch worsens. When the distance between the nozzle and the mixing unit is greater than 0.4 caliber of the device, the speed of the air jet drops and it becomes possible for the flame to penetrate the body of the burner and its failure. The length of the mixing unit should be 0.3-1.0 of its diameter. With the length of the mixing unit less than 0.3 of its diameter, despite the insufficient stabilization, the mixture of air and gas is not sufficiently effective, the combustion is carried far into the hearth and a flare can be broken. When the length of the mixing unit is greater than 1.0 of its diameter, the gas-air mixture mainly burns directly in the mixing unit and the durability of the combustion equipment decreases. FIG. 1 shows a device, a general VIEW, FIG. 2, a section A-A in FIG. 1. The device comprises a housing 1, a central pipe 2 with an open gas nozzle 3, a tangential nozzle 1 for supplying air, an air loading housing 5, a stabilizer 6, a mixing unit 7 and a toroidal burner stone 8 for forming a flat open flame. The device works as follows. Through the central pipe 2 and the gas nozzle 3 into the fuel combustion

The device serves, for example, natural gas by a continuous undistorted stream. Through the pipe C tangentially to the walls of the device under the pressure of the air. The air in the housing 5 twists and through the annular gap between the stabilizer 6 and the inner wall of the housing 5 twists the space between the nozzle 3 and the mixing unit 7 enters. In this volume the process of mixing the gas with air begins, which ends at the mixing unit. From there, the gas-air mixture enters the burner stone 8, ignites (from the effects of high temperatures in the hearth), forms a flat open flame and burns therein. After forming the combustion products (heat carrier gas), they are sucked from top to bottom through the sintered charge layer, igniting solid fuel and preparing the charge to develop the sintering process.

Stabilizer 6 ensures reliable mixing of gas and air streams and stabilization of the combustion process.

The application of the invention allows to increase the productivity of sintering machines by 1.5-2.0, to reduce the specific consumption of gaseous fuel by 3-5, solid - by 1.5-2.0, to improve the quality of sinter and reduce the volume of the forge. With such an improvement in the parameters of the agloprocess

The expected economic effect will amount to 50-85 thousand rubles, per 1 million, tons of sinter.

five

Claims (1)

Invention Formula J A device for heating incendiary furnaces "About firing machines, located on the roof of the hearth and containing a housing, a central tube with an open gas nozzle and a stabilizer, a tangential nozzle for air supply, an air spinning housing, a mixing unit and a toroidal burner stone, in order to improve the reliability of fuel combustion In a flat open flame with an air flow rate of 1, A2.5 over a wide range of variations in heat load and a reduction in specific fuel consumption per process, the stabilizer, whose diameter is 0, is caliber located at the nozzle section with an internal diameter equal to 0, 8 gauge device, and at a distance of 0.2-0, the device caliber from the nozzle 30 is located a node with a tread, the length of which is equal to 0, its diameter. Sources of information taken into account in the examination,. 1. USSR author's certificate No. 180612, class, F 27 21/06, 1972. FIG. 2